Uma wanted to test her hypothesis that fescue grass grows best under red light. Independent variables, such as size of fescue grass plants, soil type, number of plants, and length of exposure to light were kept identical for both the experimental and control groups. Uma exposed the experimental group to red, green, and blue light and the control group only to sunlight. She took daily measurements of plant height for the next three weeks.During the second week, Uma noticed that 8 of the 10 plants that she had exposed to red light looked a little wilted. She increased the daily water amount for these 8 plants. At the end of the experiment, she concluded that fescue grass grows best under red light.What is a possible flaw in Uma's experiment?
Answer(s): E
A study in Florida has revealed that the sex characteristic of an alligator is determined by temperature. Alligator eggs incubated at 30° C (86° F) hatched into female offspring. Eggs incubated at 34° C (93° F) resulted in male offspring. At the latter temperature, androgenic hormones are produced inside the eggs, resulting in the formation of male sex organs. At a temperature of 30° C, estrogenic hormones are produced, leading to the formation of female sex organs.Based on the information above, which statement is most correct?
Answer(s): A
The disposal of solid wastes is a growing problem. One solution is to bury waste between layers of earth to build up low-lying land. Another solution is to burn waste to produce energy.Which information is needed most to select the best method for maintaining a clean environment?
Answer(s): C
Work is done on an object when a force is applied, causing the object to move.Which example best illustrates this scientific idea?
Which statement correctly describes distilled water?
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